Back scratcher



FIG. 1 is a perspective view of a back scratcher showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left side elevational view thereof, the right side being a mirror image;

FIG. 5 is a front view thereof; and

FIG. 6 is a rear view thereof. 

The ornamental design for a back scratcher, substantially as shown and described. 